Java Program to display prime numbers from a group of numbers added to a LinkedList

The Program given below adds the given numbers to a linked list,checks if each of them is prime and displays prime numbers.

 import java.io.*;  
 class node  
 {  
   int data;  
   node next;  
   node(int d)  
   {  
     data=d;  
     next=null;  
   }  
   int display()  
   {  
     return(data);  
   }  
 }  
 class list  
 {  
   node first=null;  
   void insert(int d)  
   {  
     node n1=new node(d);  
     node curr;  
     curr=first;  
     if(curr==null)  
       first=n1;  
     else  
     {  
       n1.next=first;  
       first=n1;  
     }  
   }  
   void display()  
   {  
     node curr;  
     curr=first;  
     while(curr!=null)  
     {  
       int e=curr.display();  
       System.out.print(" "+e);  
       curr=curr.next;  
     }  
   }  
  }  
 public class JavaApplication2   
 {  
   public static void main(String[] args)   
   {  
     DataInputStream get=new DataInputStream(System.in);  
     int c,i,a,n,f;  
     node curr1;  
     list l1=new list();  
     list l2=new list();  
     try  
     {  
      System.out.println("Enter the limit");  
      n=Integer.parseInt(get.readLine());  
      System.out.println("Enter the nos:");  
      for(i=0;i<n;i++)  
      {   
        c=Integer.parseInt(get.readLine());  
        l1.insert(c);  
      }  
      curr1=l1.first;  
      while(curr1!=null)  
      {  
        a=curr1.data;        
        f=0;  
        for(i=2;i<(a/2);i++)  
        {  
          if(a%i==0)  
          {  
            f=1;  
            break;  
          }    
        }  
       if(f==0)  
        l2.insert(a);  
       curr1=curr1.next;  
      }  
      System.out.println("Prime nos are:");  
      l2.display();  
     }  
     catch(Exception e)  
     {  
       System.out.println(e.getMessage());  
     }  
   }  
 }